Both Lock And Unlock Do Not Function With Keyless Entry System

Trouble causes: 

• Power supply circuit malfunction in TPMS & keyless entry control module or the keyless entry control module
• Malfunction in TPMS & keyless entry control module or the keyless entry control module
• Keyless transmitter malfunction
• Keyless transmitter out of battery
• Circumference environment such as external radio waves and obstacles
• Keyless transmitter and vehicle out of sync

Wiring diagram  :

Keyless entry system Ref. to WIRING SYSTEM>KEYLESS ENTRY SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK KEYLESS TRANSMITTER  .

   Check the keyless transmitter battery. Ref. to SECURITY AND LOCKS>KEYLESS TRANSMITTER>INSPECTION .

   Is the battery OK?

   Yes:  Go to  2.

   No:  Replace the keyless transmitter battery. Ref. to SECURITY AND LOCKS>KEYLESS TRANSMITTER .

2. SYNCHRONIZE KEYLESS TRANSMITTER AND VEHICLE  .
   NOTE: Work required when both lock and unlock do not function with keyless entry system because of out of sync.

   Under a specific condition, a registered keyless transmitter may get out of sync with the vehicle and become unusable.

   Main causes of synchronization reset:

   • When the keyless transmitter button is operated exceeding a certain number of times under conditions where its signals do not reach the vehicle*.

     *Conditions where signals do not reach:

     1. The keyless transmitter is away from the vehicle.
     2. There is an obstacle between the keyless transmitter and the vehicle.
     3. There is an intense electric field (such as neon sign) around the keyless transmitter and/or the vehicle.

   • When the battery is removed and installed with the keyless transmitter button pressed.
   • When the keyless transmitter button is operated when the transmitter is out of battery.
   • When the keyless transmitter is operated near a device that emits radio waves in the 400 MHz band (smartphone, mobile PC, etc.).

   1. Press any keyless transmitter button 300 times or more at a pace of around once per second in the vicinity of the vehicle (within 5 m).
   2. Check that it operates properly.

   Is the check result OK?

   Yes  : Finish the diagnosis.

   It is possible that the keyless transmitter and the vehicle got out of sync due to use environment or improper operation.

   No  : Replace the keyless transmitter. Ref. to SECURITY AND LOCKS>KEYLESS TRANSMITTER>REPLACEMENT .

   If lock and unlock still do not function after the replacement, Go to  3.

3. CHECK DOOR LOCK CIRCUIT  .

   Check that the lock/unlock operates with the door lock switch.

   Is the check result OK?

   Yes:  Go to  4.

   No:  Check the door lock circuit. Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL SYSTEM>INSPECTION>BASIC INSPECTION .

4. CHECK FUSE  .

   Check the fuse. Ref. to WIRING SYSTEM>KEYLESS ENTRY SYSTEM .

   Is the check result OK?

   Yes:  Go to  5.

   No:  Replace the fuse.

5. CHECK HARNESS (POWER SUPPLY CIRCUIT)  .
   1. Disconnect the TPMS & keyless entry control module connector or keyless entry control module connector.
   2. Turn the ignition switch to ON.
   3. Using a tester, measure the voltage between TPMS & keyless entry control module connector or TPMS control module connector and chassis ground.

      Connector & terminal 

      (L83) No. 12 (+) - Chassis ground (-):

   Is the voltage 9 - 16 V?

   Yes:  Go to  6.

   No:  Repair or replace faulty parts.

6. CHECK HARNESS (GROUND CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Using a tester, measure the resistance between TPMS & keyless entry control module connector or keyless entry control module connector and chassis ground.

      Connector & terminal 

      (L83) No. 7 - Chassis ground:

   Is the resistance less than 1 Ω?

   Yes:  Replace the TPMS & keyless entry control module or keyless entry control module. Ref. to WHEEL AND TIRE SYSTEM>TIRE PRESSURE MONITORING. Ref. to SECURITY AND LOCKS>KEYLESS ENTRY CONTROL MODULE .

   No:  Repair or replace the open circuit of harness.